William h



W. H. BARNS.

COPPER MILL.

No. 81,869. Patented Sept. 8, 1868.

inii 13125 tttmt 'ffnm WILLAM H. BARNS, OF 'NEW LONDON, GONNECTICUT.Letters Patent No. 81,869, dated September 8, 1868.

'IMPBOVED GOI'FEE-MILL.

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T0 ALL WHOM IT MAY OONGEBN:

Be it known that I, WILLIAM H. `BA1ms,.of New London, in the county ofNew London, and State of C'onnectiout, have invented 8 new'and improvedMill for Grinding Coffee and other substauces; and I- do hereby.de'clare that the following in a full, clear, and exact 'descriptionthercof, whioh will enable those ekilled iu the art to make and use thesame, reference being had to the accompanying drawings, formiug part ofthis' specifioation, in which- Figure 1 is a front view of my improvedmill, showiu runuer within.

Figura 2 is a section of the mili through the'lihe x z, fig. 1.

.Similar letters of reference indicate corresponding' parts. i Thisinvention consists in placing a-coiled spring around the arbor of therotating grinding-plate or runner, so called, of a coifee-mill, or suchother ana-logous grinding-mills as are susceptible of and are improvedby the application of the coiled spring, as above mentioned. l

I In the drawings, A is thoboard to whichsuch mills are usually afiixed.B, is the hopper. D, the shell.

C, the runner, and t EE the cranlr-handle, ser on the arbor of theru'ner, to rotate the latter in the operation of grindiug.

The coiled spring a is on the arbor of the runner, and exorts itstension against the plane face of the shell and the eye e of the'crank,as shown, which latter is hel'd. on by a nut, b, working on ascrew-thread on the end 'of the arhor of the runner C.

The eye c of`the crank is fitted in a sqnared (or other suitably-formed)end of the arhor, so as to move in or out on the said arhor,-inobedicuce to the nut b or spring a, respectively, so that when the nutis turned to actuate the eye against the spring, the latter will beco'mpressed, and greater tenson thereby obtaiued.

When the nut is turned in the reverse direction, the spring will boproportionatly relieved, and consequently less tension upon the springwill result.

g a portion of the shell broken away, toexhibit the By those Operationsit will be seen that the runner may be made t.impinge upon thegrinding-surface of the shell with more or less force, and will therebygrind'v fine'r'or cosrser, aocording as itis adjusted for that object,by turniug the nut b. v

The advantages of this invention are as follows :I First, theadjusting-hurr, which in such mlls was heretofore' placed on the back,is dispensed with, thus .permitting the board A to be aflixed 'toa flatwall or other suitable surface, for when the a'djusting-burr is placedon the back ofthe mill, the lattcr must be afiixed to someiheam or likeplace, so that the board A can project from the wall, for the purpose ofhaving the said burr on the back accessible to adjuht the mill.

Second, any hard foreign substance, getting by accident into .the mill,will not break or stop'it, for the spring will yield and allow it topass through without damage`` Third, the runner can be adjnsted withgreater exnctness, and the spring-tension will keep such adjustment frombecoming impaired.

I claim as new, anddesire to 'secure by Letters Patent- The combinationand arrangement of the coilcd spring a with the arbor of the runner O,shell D, and nut `Z, all Operating substantially as shown and described;and for the purpose set forth.

The above specificatiou of'my inve'nt on signed. by 'm8, this niueteenthday of June, 1868.

WM. -H. BARNS.

Witncsses:

JOHN Gnaon, E'DWARD T. BnowN

